I sold my Nexus 5x and I forgot to do a factory reset and I already shipped the phone to its new owner. Then, during transit of the package I used Android Device Manger (online webpage) to 'wipe' the data off the phone. I figured problem solved but now the new owner has contacted me and he's saying the phone is aksing for my credentials. Even after doing a factory reset with using the physical buttons. Is there any way to reset the phone back to its factory settings without him having to ship the phone back to me? I could really use your help on this.